Hurefu zvimiro zve isosceles triangle

Muchinyorwa chino, isu tichatarisa hukuru hwehurefu hweiyo isosceles triangle, pamwe nekuongorora mienzaniso yekugadzirisa matambudziko panyaya iyi.

Cherechedza: triangle inonzi maringe, kana maviri emativi ayo akaenzana (lateral). Rutivi rwechitatu runonzi hwaro.

Altitude zvivakwa mune isosceles triangle

Chivakwa 1

Mune isosceles triangle, marefu maviri akadhonzwa kumativi akaenzana.

AE = CD

Reverse wording: Kana marefu maviri akaenzana mugonyo, saka isosceles.

Chivakwa 2

Mune isosceles triangle, kureba kwakaderedzwa kusvika kugasi panguva imwe chete iyo bisector, yepakati, uye perpendicular bisector.

• BD - kureba kunokweverwa pachigadziko AC;
• BD ndiye wepakati, saka AD = DC;
• BD ndiye bisector, saka kona α yakaenzana nekona β.
• BD - perpendicular bisector kudivi AC.

Chivakwa 3

Kana mativi/makona eisosceles triangle achizivikanwa, zvino:

1. Hurefu hurefu h_ayakadzikiswa pachigadziko a, inoverengerwa neformula:

• a - chikonzero;
• b – divi.

2. Hurefu hurefu h_bkudhonzwa parutivi b, zvakaenzana:

p - iyi ndiyo hafu-perimeter yegonyo, inoverengwa sezvinotevera:

3. Kureba kudivi kunogona kuwanikwa kuburikidza nesine yekona uye kureba kwedivi triangle:

Cherechedza: kune isosceles triangle, iyo yakajairika urefu zvivakwa zvinoratidzwa mune yedu kudhindwa - zvinoshandawo.

Muenzaniso wedambudziko

Basa 1

Isosceles triangle inopiwa, hwaro hwayo huri 15 cm, uye rutivi 12 cm. Tsvaga hurefu hwehurefu hwakadzikiswa kusvika pachigadziko.

mhinduro

Ngatishandisei fomula yekutanga inoratidzwa mukati Chivakwa 3:

Basa 2

Tsvaga hurefu hwakakweverwa kudivi reisosceles triangle 13 cm kureba. Nheyo yemufananidzo ndeye 10 cm.

mhinduro

Kutanga, tinoverenga semiperimeter yegonyo:

Zvino shandisa fomura yakakodzera yekutsvaga hurefu (inomiririrwa mukati Chivakwa 3):